2005 Chevrolet Trailblazer body & structure problems

Crashed straight into the back end of a vehicle doing 60 while I was doing atleast 80, or 85, maybe more, I don't remember. The first thing I remember seeing is realizing I'm alright despite the blood in the cockpit and on my face despite sneezing which was spreading blood. Is this a vehicle defect or what? My math says that crashing at 85MPH into a vehicle doing 60 is like crashing into a brick wall at 25MPH.

Chevy trailblazer has a whistling sound that is not able to be located to be fixed, the seals on the doors have been replaced as well as the weather stripping. The lights on the vehicles interior as well as head light go dim when the gas pedal is not pressed. The head lights flicker causing a distraction to the driver of the vehicle as well as on coming cars as it appears that someone is flashing their lights to on coming cars.